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“the separation of the total AM into orbital and spin parts has restricted physical meaning.... States with definite values of OAM and SAM do not satisfy the condition of transversality in the general case.” A. I. Akhiezer, V. B. Berestetskii, “Quantum Electrodynamics” (1965)  transversality constraint: 3D  2D Nonparaxial problem 1 though

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